The irreducible spherical tensor technique applied to nonlinear processes in gases: application to coherent anti-Stokes Raman scattering (CARS)

The calculation of nonlinear susceptibilities for atoms and molecules is of great interest both for device applications (e.g. harmonic generation and frequency conversion) and for spectroscopy. An example of the latter is the recent interest in CARS, which has experimental advantages over Raman scattering